Local measurements of tunneling magneto-conductance oscillations in monolayer, Bernal-stacked bilayer, and ABC-stacked trilayer graphene  

作　　者：Ya-Ning Ren Mo-Han Zhang Chao Yan Yu Zhang Lin He 

机构地区：[1]Center for Advanced Quantum Studies,Department of Physics,Beijing Normal University,Beijing 100875,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2021年第8期72-77,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11974050,and 11674029);support from the National Program for Support of Top-notch Young Professionals;the“Fundamental Research Funds for the Central Universities”;the“Chang Jiang Scholars Program”。

摘　　要：Shubnikov-de Haas oscillations are the most well-known magneto-oscillations in transport measurements. They are caused by Landau quantization of two-dimensional(2D) electron systems in the presence of a magnetic field. Here we demonstrate that a scanning tunneling microscope(STM) can locally measure similar magneto-oscillations in 2D systems. In Landau level spectroscopy measurements with fine magnetic-field increments, we observed fixed-energy magnetic-field-dependent oscillations of the local density of states. From the measured tunneling magneto-conductance oscillations acquired by STM, energymomentum dispersions and Berry phases of a monolayer, Bernal-stacked bilayer, and ABC-stacked trilayer graphene were obtained. The reported method is applicable to a wide range of materials because it can obtain the magneto-oscillations of 2D systems larger than the magnetic length;importantly, it also requires no gate electrode.

关 键 词：GRAPHENE magneto-conductance oscillations scanning tunneling microscopy energy-momentum dispersion Berry phase 

分 类 号：TQ127.11[化学工程—无机化工] O469[理学—凝聚态物理]